code: def test_objectmapper(self):
      df = pdml.ModelFrame([])
      self.assertIs(
          df.tree.DecisionTreeClassifier, tree.DecisionTreeClassifier
      )
      self.assertIs(
          df.tree.DecisionTreeRegressor, tree.DecisionTreeRegressor
      )
      self.assertIs(
          df.tree.ExtraTreeClassifier, tree.ExtraTreeClassifier
      )
      self.assertIs(df.tree.ExtraTreeRegressor, tree.ExtraTreeRegressor)
      self.assertIs(df.tree.export_graphviz, tree.export_graphviz)
  
file_path: pandas-ml/pandas_ml/skaccessors/test/test_tree.py
imports: import pytest
  import sklearn.datasets
  import sklearn.tree
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 1 for calling the TestTree obj's underlying member method code with example usage: obj.test_objectmapper() without return types